EP0197243B1 - Multi-coordinate contact probe - Google Patents

Multi-coordinate contact probe Download PDF

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Publication number
EP0197243B1
EP0197243B1 EP86100629A EP86100629A EP0197243B1 EP 0197243 B1 EP0197243 B1 EP 0197243B1 EP 86100629 A EP86100629 A EP 86100629A EP 86100629 A EP86100629 A EP 86100629A EP 0197243 B1 EP0197243 B1 EP 0197243B1
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EP
European Patent Office
Prior art keywords
sensing head
coordinate
bodies
probe
sensing
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Expired
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EP86100629A
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German (de)
French (fr)
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EP0197243A1 (en
Inventor
Kurt Feichtinger
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Dr Johannes Heidenhain GmbH
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Dr Johannes Heidenhain GmbH
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Priority to AT86100629T priority Critical patent/ATE39285T1/en
Publication of EP0197243A1 publication Critical patent/EP0197243A1/en
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Publication of EP0197243B1 publication Critical patent/EP0197243B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
    • G01B11/005—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates coordinate measuring machines
    • G01B11/007—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates coordinate measuring machines feeler heads therefor

Definitions

  • the invention relates to a multi-coordinate probe according to the preamble of claim 1.
  • DE-OS-2 841 424 specifies a measuring head which has a three-point bearing.
  • Three V-grooves are arranged in a star shape in the bottom of the probe head.
  • Three pins with a spherical surface are firmly fixed in the measuring plate.
  • the measuring plate is pressed in the direction of the probe housing base by means of a spring and the pins assume a fixed position in the assigned V-grooves, into which they are after a deflection of the EP-A2-0 088 596 a bearing arrangement with three bearing points known.
  • the bearings are also evenly distributed over the circumference in one level.
  • Three balls are arranged in the bottom of the probe housing and can be moved in the direction of the stylus for assembly.
  • the three counter bearings in the measuring plate are designed differently.
  • a counter bearing is designed as an anti-rotation device in the form of a bore.
  • the second counter bearing has a V-groove, which is aligned to the center of the measuring plate.
  • a third counter bearing is a flat support, parallel to the measuring plate and perpendicular to the force component of the pressure spring.
  • the object of the invention is to provide a storage for multi-coordinate probes, which defines the position of the movable part to the housing-fixed part of the probe with high precision and ensures defined and constant probing conditions in all probing directions.
  • the invention strives for a precise and simple assembly of a large number of bearings of the same design without having to use components with high precision.
  • the arrangement according to the invention ensures that a good return accuracy of the stylus in its zero position is guaranteed after each deflection.
  • the arrangement of similar bearing points evenly over the circumference of the measuring plate in one plane largely prevents the probing ball from deflecting in different preferred directions depending on the probing direction, and thus largely ensures repeatability of the measurement regardless of the probing direction.
  • FIG. 1 The entire structure of a multi-coordinate probe can be seen in FIG.
  • This button shown is designed as a switching button for a measuring system.
  • the probe Through a shaft 1, the probe can be inserted into a spindle of a measuring or processing machine, not shown.
  • the deflection of a stylus 2 is possible in all directions.
  • a seal 3 closes the space between a probe housing 4 and the stylus 2.
  • a sheet metal protection 5 prevents damage to the seal 3 by hot chips, but leaves a free space 6, which allows the stylus 2 a limited deflection from its zero position.
  • a detector arrangement 7, 8, 9 for detecting the deflection of the stylus 2 emits a probing pulse at a specific deflection amount, which is used to control a machine tool or to determine the point in time at which a measured value is accepted Coordinate measuring machine is used.
  • the detector arrangement 7, 8, 9 consists of an optical transmitter 7, which is fixed in the probe housing 4, and a differential photocell 8, which is also aligned with it.
  • a lens system 9 is fixedly attached to the movable stylus 2 in the optical axis of the two elements 7, 8.
  • a measuring plate 10 is firmly connected to the stylus 2, which has a probe ball 11 at the end.
  • One surface of the measuring plate 10 is connected to the probe housing 4 by means of a spring 12.
  • the counter surface is part of the mounting of the measuring plate 10 with the probe housing bottom 13. This mounting must be carried out exactly, since a static under- or over-determination causes measurement errors.
  • the measuring plate 10 is held in place by the spring 12, the force of which counteracts the effect of the contact pressure of the probe ball 11 on the workpiece, and prevents the measuring plate 10 from being pivoted or lifted off in the bearing, if this force is below a certain value.
  • the measuring plate 10 is held against the probe housing bottom 13 by the spring 12, the measuring plate 10 and the probe housing 4 form a unit with zero degree of freedom. After deflection, the spring 12 is loaded so that it returns the measuring plate 10 against the probe housing bottom 13.
  • the storage designed as a multi-point bearing, according to the invention consists of balls 14 which are uniformly distributed over the circumference of the measuring plate 10 and arranged in one plane and which are firmly anchored in the measuring plate 10.
  • a bore 15 on the fastening base of each ball 14 serves to supply an adhesive 16 and to penetrate a possibly damaged ball 14.
  • Each of the sixteen balls 14 is assigned a cylinder body 17 as a counter bearing. Fifteen of these cylinder bodies 17 are provided with a V-groove 18 at the end which is associated with the balls 14.
  • a cylinder body is designed in the form of a hollow cylinder 19 to secure the measuring plate 10 against rotation.
  • each cylinder body 17 are aligned so that their longitudinal axis is parallel to the longitudinal axis of the stylus 2 resting in the zero position. So that each ball 14 comes to lie in the assigned V-groove 18 in a defined manner, each cylinder body 17 is rotatably mounted about its longitudinal axis and is displaceable in its longitudinal axis.
  • the cylinder body 17 adapts to the ball 14 by rotating about its own longitudinal axis (FIG. 3b ).
  • each bearing point is thus formed by the interaction of the surface areas of the balls 14 with the surface areas of the V-grooves 18 of the cylinder body 17 fixedly arranged in the probe head housing 4.
  • a precise and simple alignment of the V-grooves 18 of the cylinder body 17 to the balls 14 is achieved in that, during assembly, the cylinder body 17 by means of a before the curing of the adhesive which is intended to fix the cylinder body 17 in the probe head base 13 during later measurement operation Vibration device, not shown, can be automatically, quickly and completely aligned.
  • the vibrating device contains a spring arrangement which adjusts each cylinder body 17 in the Z direction. By continuously reducing the high-frequency vibration amplitudes, it is ensured that the cylinder bodies 17 also rotate into a stable position about their own axis as the degree of hardening of the adhesive increases.
  • the cylinder bodies do not necessarily have to be part of the probe head base as shown, they can also be integrated into the measuring plate. In addition to the possibility shown, a pairing of the bearing elements is also necessary. the following variant was also given: pen with spherical surface ./. V-groove cylinder body.
  • one of the cylinder bodies 17 is designed as a hollow cylinder 19 for securing the measuring plate 10 against rotation.
  • This anti-rotation device can also be designed as a spherical depression or as a negative pyramid tip.
  • the anti-rotation lock can also be omitted, since the probability increases with increasing bearing points that the cylinder bodies 17 with the V-grooves 18 rotate against one another during assembly so that they are secured against rotation when they are installed of the measuring plate 10 act.
  • a not shown but advantageous design modification of the described embodiment is that the cylinder body are attached with a uniform inclination in the direction of the probe ball in the probe head bottom.

Abstract

A multi-coordinate probe with a stylus is disclosed wherein the stylus has a mounting or seating location defining its zero position. The stylus is deflectable from the zero position in several coordinate directions and is urged by a restoring force back into its zero position. The mounting location of the stylus is formed by the cooperation of surface areas of a plurality of balls with associated surface areas of support members. The balls and the support members are centrally arranged about the axis of the probe. The balls are fixedly mounted on a mounting member while the support members, which preferably are in the form of cylinder bodies with a V-shaped groove in the surface facing the balls, are, during assembly of the probe, rotatable about their own axis and axially movable to accomplish the desired precision seating of the ball surfaces in the grooves. After the positioning is accomplished, the cylindrical bodies are immovably fixed within the probe casing. A method is also disclosed to facilitate the precision seating of the balls in the grooves during assembly of the probe.

Description

Die Erfindung betrifft einen Mehrkoordinaten-Tastkopf gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a multi-coordinate probe according to the preamble of claim 1.

Es sind eine Vielzahl messender und schaltender Mehrkoordinaten-Tastköpfe bekannt. Bei beiden Ausführungsarten ist es besonders wichtig, daß der Taststift nach Auslenkungen in beliebiger Richtung wieder in seine definierte Nullage zurückkehrt. Verschiedenartige Versuche, Lagerungen des Taststiftes zum Tastergehäuse besonders vorteilhaft auszubilden, wurden deshalb unternommen.A large number of measuring and switching multi-coordinate probes are known. In both embodiments, it is particularly important that the stylus returns to its defined zero position after deflections in any direction. Various attempts have therefore been made to design bearings of the stylus relative to the stylus housing in a particularly advantageous manner.

In der DE-OS-2 841 424 ist ein Meßkopf angegeben der eine Dreipunktlagerung aufweist. Im Tastkopfgehäuseboden sind drei V-Nuten sternförmig angeordnet. Im Meßteller sind drei Stifte mit sphärischer Oberfläche fest fixiert. Der Meßteller wird mittels einer Feder in Richtung des Tastkopfgehäusebodens gedrückt und die Stifte nehmen in den zugeordneten V-Nuten eine festgelegte Position ein, in welche sie nach einer Auslenkung des Ferner ist aus der EP-A2-0 088 596 eine Lageranordnung mit ebenfalls drei Lagerstellen bekannt. Die Lagerstellen sind ebenfalls in einer Ebene gleichmäßig über den Umfang verteilt. Im Tastkopfgehäuseboden sind drei Kugeln angeordnet, welche zur Montage in Richtung des Taststiftes verschiebbar sind. Die drei Gegenlager im Meßteller sind unterschiedlich ausgebildet. Ein Gegenlager ist als Verdrehsicherung in Form einer Bohrung ausgebildet. Das zweite Gegenlager weist eine V-Nut auf, welche fest zum Mittelpunkt des Meßtellers ausgerichtet ist. Ein drittes Gegenlager ist eine ebene Auflage, parallel zum Meßteller und senkrecht zur Kraftkomponente der Andruckfeder.DE-OS-2 841 424 specifies a measuring head which has a three-point bearing. Three V-grooves are arranged in a star shape in the bottom of the probe head. Three pins with a spherical surface are firmly fixed in the measuring plate. The measuring plate is pressed in the direction of the probe housing base by means of a spring and the pins assume a fixed position in the assigned V-grooves, into which they are after a deflection of the EP-A2-0 088 596 a bearing arrangement with three bearing points known. The bearings are also evenly distributed over the circumference in one level. Three balls are arranged in the bottom of the probe housing and can be moved in the direction of the stylus for assembly. The three counter bearings in the measuring plate are designed differently. A counter bearing is designed as an anti-rotation device in the form of a bore. The second counter bearing has a V-groove, which is aligned to the center of the measuring plate. A third counter bearing is a flat support, parallel to the measuring plate and perpendicular to the force component of the pressure spring.

Es ist allgemein bekannt, daß sich Meßkraftunterschiede und die damit verbundenen biegungsbedingten Schaltwegdifferenzen bei verschiedenen Antastrichtungen durch die Erhöhung der Anzahl von Lagerstellen vermindert. Bei einer Erhöhung der Anzahl von Lagerstellen erhöht sich aber bei den bisher bekannten Tastkopfsystemen der Aufwand für die Herstellung der Paßungslagerstellen erheblich, und es besteht die Gefahr, daß das System statisch überbestimmt wird.It is generally known that differences in measuring force and the bending-related switching path differences associated therewith are reduced in different probing directions by increasing the number of bearing points. With an increase in the number of bearing points, however, the effort for the production of the fit bearing points increases considerably in the previously known probe systems, and there is a risk that the system will be statically overdetermined.

Durch unterschiedliche Ausführungsformen der Lagerstellen wurde deshalb beim angegebenen Stand der Technik nach EP-A2-0 008 596 versucht, eine statische Überbestimmung, aber auch Unterbestimmung zu vermeiden.Different embodiments of the bearing points have therefore been used in the state of the art specified in EP-A2-0 008 596 to try to avoid static over-determination but also under-determination.

Unterschiedlich ausgeführte Lagerstellen sind somit bei beiden angegebenen Systemen notwendig, wenn mehr als drei Lagerstellen geschaffen werden sollen. Dadurch wird zwar eine hohe Nullpunktstabilität geschaffen, mit dem Nachteil, daß bei einer Antastung der Tastkugel an ein Werkstück je nach Antastrichtung ein Ausweichen in verschiedene Vorzugsrichtungen wahrscheinlich wird.Different bearing positions are therefore necessary in both systems if more than three bearing points are to be created. This creates a high zero point stability, with the disadvantage that when probing the probe ball against a workpiece, it is likely that it will move in different preferred directions depending on the probing direction.

Aufgabe der Erfindung ist es, eine Lagerung für Mehrkoordinaten-Tastköpfe anzugeben, die die Position des beweglichen Teiles zum gehäusefesten Teil des Tasters hochgenau festlegt und definierte sowie konstante Antastbedingungen in allen Antastrichtungen gewährleistet.The object of the invention is to provide a storage for multi-coordinate probes, which defines the position of the movable part to the housing-fixed part of the probe with high precision and ensures defined and constant probing conditions in all probing directions.

Des weiteren wird mit der Erfindung eine präzise und einfache Montage einer Vielzahl gleichartig ausgebildeter Lagerstellen angestrebt, ohne daß Bauteile mit hoher Präzision verwendet werden müssen.Furthermore, the invention strives for a precise and simple assembly of a large number of bearings of the same design without having to use components with high precision.

Diese Aufgabe wird gemäß der Erfindung durch die Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention by the features of claim 1.

Die erfindungsgemäße Anordnung bietet die Gewähr dafür, daß eine gute Rückstellgenauigkeit des Taststiftes in seine Nullage nach jeder Auslenkung garantiert ist. Durch die Anordnung gleichartiger Lagerstellen gleichmäßig über den Umfang des Meßtellers in einer Ebene, wird ein Ausweichen der Antastkugel je nach Antastrichtung in verschiedene Vorzugsrichtungen weitgehend verhindert und somit wird eine Wiederholbarkeit der Messung unabhängig von der Antastrichtung weitgehend gesichert.The arrangement according to the invention ensures that a good return accuracy of the stylus in its zero position is guaranteed after each deflection. The arrangement of similar bearing points evenly over the circumference of the measuring plate in one plane largely prevents the probing ball from deflecting in different preferred directions depending on the probing direction, and thus largely ensures repeatability of the measurement regardless of the probing direction.

Eine in der Erfindung angegebene vorteilhafte Montage der Lagerteile ist einfach und hochgenau durchführbar, wobei eine statische Über- aber auch Unterbestimmung des Lagersystems ausgeschlossen wird.An advantageous assembly of the bearing parts specified in the invention can be carried out simply and with high precision, with a static over- and under-determination of the storage system being excluded.

Weitere bevorzugte Einzelheiten des erfindungsgemäßen Mehrkoordinaten-Tastkopfes sind Gegenstand der Unteransprüche.Further preferred details of the multi-coordinate probe according to the invention are the subject of the dependent claims.

Anhand der Zeichnungen wird ein Ausführungsbeispiel näher erläutert.An exemplary embodiment is explained in more detail with reference to the drawings.

Es zeigen

  • Figur 1 einen Axialschnitt durch einen erfindungsgemäßen Tastkopf,
  • Figur 2 einen Schnitt in der Ebene II - II aus Figur 1 mit abgenommenem Meßteller,
  • Figur 3a u. 3b das Prinzip der Lagereinstellung.
Show it
  • FIG. 1 shows an axial section through a probe head according to the invention,
  • FIG. 2 shows a section in the plane II-II from FIG. 1 with the measuring plate removed,
  • Figure 3a u. 3b the principle of bearing adjustment.

In Figur 1 ist der gesamte Aufbau eines Mehrkoordinaten-Tastkopfes ersichtlich. Dieser gezeigte Taster ist als schaltender Taster für ein Meßsystem ausgeführt. Durch einen Schaft 1 kann der Taster in eine Spindel einer nicht dargestellten Meß- oder Bearbeitungsmaschine eingesetzt werden. Die Auslenkung eines Taststiftes 2 ist in allen Richtungen möglich. Eine Dichtung 3 schließt den Zwischenraum zwischen einem Tastkopfgehäuse 4 und dem Taststift 2. Ein Blechschutz 5 verhindert die Beschädigung der Dichtung 3 durch heiße Späne, läßt aber einen freien Raum 6, der dem Taststift 2 eine begrenzte Auslenkung aus seiner Nullage gestattet.The entire structure of a multi-coordinate probe can be seen in FIG. This button shown is designed as a switching button for a measuring system. Through a shaft 1, the probe can be inserted into a spindle of a measuring or processing machine, not shown. The deflection of a stylus 2 is possible in all directions. A seal 3 closes the space between a probe housing 4 and the stylus 2. A sheet metal protection 5 prevents damage to the seal 3 by hot chips, but leaves a free space 6, which allows the stylus 2 a limited deflection from its zero position.

Eine Detektoranordnung 7, 8, 9 zur Erfassung der Auslenkung des Taststiftes 2 gibt bei einem bestimmten Auslenkungsbetrag einen Antastimpuls ab, welcher zur Steuerung einer Werkzeugmaschine oder zur Bestimmung des Zeitpunktes der Meßwertübernahme einer Koordinaten-Meßmaschine herangezogen wird. Die Detektoranordnung 7, 8, 9 besteht aus einem im Tastkopfgehäuse 4 feststehenden optischen Sender 7 und einem dazu ausgerichteten ebenfalls feststehenden Differentialphotoelement 8. In der optischen Achse der beiden Elemente 7, 8 ist ein Linsensystem 9 fest am beweglichen Taststift 2 angebracht.A detector arrangement 7, 8, 9 for detecting the deflection of the stylus 2 emits a probing pulse at a specific deflection amount, which is used to control a machine tool or to determine the point in time at which a measured value is accepted Coordinate measuring machine is used. The detector arrangement 7, 8, 9 consists of an optical transmitter 7, which is fixed in the probe housing 4, and a differential photocell 8, which is also aligned with it. A lens system 9 is fixedly attached to the movable stylus 2 in the optical axis of the two elements 7, 8.

Ein Meßteller 10 ist mit dem Taststift 2 fest verbunden, welcher am Ende eine Antastkugel 11 besitzt. Eine Fläche des Meßtellers 10 steht mit dem Tastkopfgehäuse 4 mittels einer Feder 12 in Verbindung. Die Gegenfläche ist ein Teil der Lagerung des Meßtellers 10 mit dem Tastkopfgehäuseboden 13. Diese Lagerung muß exakt ausgeführt sein, da eine statische Unter- bzw. Überbestimmung Meßfehler verursacht.A measuring plate 10 is firmly connected to the stylus 2, which has a probe ball 11 at the end. One surface of the measuring plate 10 is connected to the probe housing 4 by means of a spring 12. The counter surface is part of the mounting of the measuring plate 10 with the probe housing bottom 13. This mounting must be carried out exactly, since a static under- or over-determination causes measurement errors.

Während eines Antastvorganges an ein Werkstück wird der Meßteller 10 durch die Feder 12 an Ort und Stelle gehalten, deren Kraft der Wirkung des Kontaktdrucks der Antastkugel 11 auf das Werkstück entgegenwirkt, und verhindert, daß der Meßteller 10 in der Lagerung verschwenkt bzw. abgehoben wird, wenn diese Kraft unter einem bestimmten Wert liegt. Solange der Meßteller 10 gegen den Tastkopfgehäuseboden 13 durch die Feder 12 gehalten wird, bilden Meßteller 10 und Tastkopfgehäuse 4 eine Einheit mit dem Freiheitsgrad Null. Nach einer Auslenkung wird die Feder 12 so belastet, daß sie den Meßteller 10 gegen den Tastkopfgehäuseboden 13 zurückführt.During a probing process on a workpiece, the measuring plate 10 is held in place by the spring 12, the force of which counteracts the effect of the contact pressure of the probe ball 11 on the workpiece, and prevents the measuring plate 10 from being pivoted or lifted off in the bearing, if this force is below a certain value. As long as the measuring plate 10 is held against the probe housing bottom 13 by the spring 12, the measuring plate 10 and the probe housing 4 form a unit with zero degree of freedom. After deflection, the spring 12 is loaded so that it returns the measuring plate 10 against the probe housing bottom 13.

Die Lagerung, ausgeführt als Mehrpunktlager, besteht erfindungsgemäß aus gleichmäßig über den Umfang des Meßtellers 10 verteilter und in einer Ebene angeordneter Kugeln 14, welche fest im Meßteller 10 verankert sind. Eine Bohrung 15 am Befestigungsgrund jeder Kugel 14 dient zum Zuführen eines Klebstoffes 16 und zum Durchschlagen einer evtl. beschädigten Kugel 14. Jeder der sechzehn Kugeln 14 ist als Gegenlager ein Zylinderkörper 17 zugeordnet. Fünfzehn dieser Zylinderkörper 17 sind an dem Ende, welches den Kugeln 14 zugeordnet ist, mit einer V-Nut 18 versehen. Ein Zylinderkörper ist in Form eines Hohlzylinders 19 zur Sicherung des Meßtellers 10 gegen Verdrehen ausgebildet.The storage, designed as a multi-point bearing, according to the invention consists of balls 14 which are uniformly distributed over the circumference of the measuring plate 10 and arranged in one plane and which are firmly anchored in the measuring plate 10. A bore 15 on the fastening base of each ball 14 serves to supply an adhesive 16 and to penetrate a possibly damaged ball 14. Each of the sixteen balls 14 is assigned a cylinder body 17 as a counter bearing. Fifteen of these cylinder bodies 17 are provided with a V-groove 18 at the end which is associated with the balls 14. A cylinder body is designed in the form of a hollow cylinder 19 to secure the measuring plate 10 against rotation.

Die Zylinderkörper 17 sind so ausgerichtet, daß sich ihre Längsachse parallel zur Längsachse des in der Nullage ruhenden Taststiftes 2 befinden. Damit jede Kugel 14 definiert in die zugeordnete V-Nut 18 zu liegen kommt, ist jeder Zylinderkörper 17 um seine Lähgsachse drehbar gelagert sowie in seiner Längsachse verschiebbar.The cylinder body 17 are aligned so that their longitudinal axis is parallel to the longitudinal axis of the stylus 2 resting in the zero position. So that each ball 14 comes to lie in the assigned V-groove 18 in a defined manner, each cylinder body 17 is rotatably mounted about its longitudinal axis and is displaceable in its longitudinal axis.

Wenn nun bei der Montage des Meßtellers 10 mit dem Tastkopfgehäuse 4 ein Kugelmittelpunkt nicht mit dem Grund der V-Nut 18 koordiniert (Figur 3a), paßt sich der Zylinderkörper 17 der Kugel 14 an, indem er sich um die eigene Längsachse dreht (Figur 3b).If, when mounting the measuring plate 10 with the probe housing 4, a center of the ball does not coordinate with the bottom of the V-groove 18 (FIG. 3a), the cylinder body 17 adapts to the ball 14 by rotating about its own longitudinal axis (FIG. 3b ).

Nach der relativ einfach durchführbaren Einjustierung der Zylinderkörper 17 werden diese fest mit dem Tastkopfgehäuseboden 13 verbunden, bevorzugt eingeklebt. Jede Lagerstelle wird somit durch das Zusammenwirken der Oberflächenbereiche der Kugeln 14 mit den Oberflächenbereichen der V-Nuten 18 der im Tastkopfgehäuse 4 fest angeordneten Zylinderkörper 17 gebildet.After the relatively simple adjustment of the cylinder bodies 17, these are firmly connected to the probe housing base 13, preferably glued. Each bearing point is thus formed by the interaction of the surface areas of the balls 14 with the surface areas of the V-grooves 18 of the cylinder body 17 fixedly arranged in the probe head housing 4.

Eine genaue und einfache Ausrichtung der V-Nuten 18 der Zylinderkörper 17 zu den Kugeln 14 wird dadurch erreicht, daß bei der Montage vor der Aushärtung des Klebstoffes, welcher die Zylinderkörper 17 im Tastkopfgehäuseboden 13 bei späterem Meßbetrieb fest fixieren soll, die Zylinderkörper 17 mittels einer nicht gezeigten Vibrationseinrichtung automatisch, schnell und vollständig ausgerichtet werden. Die Vibrationseinrichtung enthält eine Federanordnung, welche jeden Zylinderkörper 17 in der Z-Richtung einjustiert. Durch laufende Verringerung der hochfrequenten Vibrationsamplituden wird sichergestellt, daß sich die Zylinderkörper 17 mit zunehmendem Aushärtungsgrad des Klebstoffes außerdem in eine stabile Lage um ihre eigene Achse drehen.A precise and simple alignment of the V-grooves 18 of the cylinder body 17 to the balls 14 is achieved in that, during assembly, the cylinder body 17 by means of a before the curing of the adhesive which is intended to fix the cylinder body 17 in the probe head base 13 during later measurement operation Vibration device, not shown, can be automatically, quickly and completely aligned. The vibrating device contains a spring arrangement which adjusts each cylinder body 17 in the Z direction. By continuously reducing the high-frequency vibration amplitudes, it is ensured that the cylinder bodies 17 also rotate into a stable position about their own axis as the degree of hardening of the adhesive increases.

Die Zylinderkörper müssen nicht unbedingt wie in gezeigter Weise Bestandteil des Tastkopfgehäusebodens sein, sie können ebenso gut in den Meßteller integriert werden. Des weiteren ist außer der gezeigten Möglichkeit eine Paarung der Lagerelemente u.a. noch folgende Variante gegeben: Stift mit sphärischer Oberfläche ./. Zylinderkörper mit V-Nut.The cylinder bodies do not necessarily have to be part of the probe head base as shown, they can also be integrated into the measuring plate. In addition to the possibility shown, a pairing of the bearing elements is also necessary. the following variant was also given: pen with spherical surface ./. V-groove cylinder body.

In den Figuren 1 und 2 ist einer der Zylinderkörper 17 als Hohlzylinder 19 zur Sicherung des Meßtellers 10 gegen Verdrehen ausgebildet. Diese Verdrehsicherung kann aber auch als sphärische Vertiefung bzw. als negative Pyramidenspitze ausgeführt sein.In FIGS. 1 and 2, one of the cylinder bodies 17 is designed as a hollow cylinder 19 for securing the measuring plate 10 against rotation. This anti-rotation device can also be designed as a spherical depression or as a negative pyramid tip.

Bei einer größeren Anzahl von erfindungsgemäß ausgestalteten Lagerstellen kann die Verdrehsicherung auch entfallen, da die Wahrscheinlichkeit mit zunehmenden Lagerstellen zunimmt, daß sich die Zylinderkörper 17 mit den V-Nuten 18 bei der Montage so gegeneinander verdrehen, daß sie bei erfolgter Montage als Sicherung gegen das Verdrehen des Meßtellers 10 wirken.With a larger number of bearing points designed according to the invention, the anti-rotation lock can also be omitted, since the probability increases with increasing bearing points that the cylinder bodies 17 with the V-grooves 18 rotate against one another during assembly so that they are secured against rotation when they are installed of the measuring plate 10 act.

Eine nicht gezeigte aber vorteilhafte konstruktive Abänderung des beschriebenen Ausführungsbeispiels besteht darin, daß die Zylinderkörper mit gleichmäßiger Neigung in Richtung der Antastkugel im Tastkopfgehäuseboden befestigt sind.A not shown but advantageous design modification of the described embodiment is that the cylinder body are attached with a uniform inclination in the direction of the probe ball in the probe head bottom.

Besonders vorteilhaft wird jene Neigung der Zylinderkörper angesehen, daß die Längsachse jedes Zylinderkörpers durch den Mittelpunkt der Antastkugel verläuft. Diese Anordnung garantiert bei jeder beliebigen Antastrichtung auch bei größeren Auslenkungen des Taststiftes eine definierte Kraftverteilung von Antastkugel zu Lagerstelle.Particularly advantageous is the inclination of the cylinder body that the longitudinal axis of each cylinder body runs through the center of the probe ball. This arrangement guarantees a defined force distribution from the probe ball to the bearing point in any probing direction, even with larger deflections of the stylus.

Es wird noch darauf hingewiesen, daß in den Zeichnungen nur eine Auswahl gleicher Kugeln 14 und Zylinderkörper 17 mit einem Bezugszeichen versehen wurde.It should also be noted that only a selection of identical balls 14 and cylinder bodies 17 has been provided with a reference symbol in the drawings.

Claims (8)

1. Multi-coordinate sensing head with at least one sensing rod (2) deflectable in a plurality of coordinate directions, which is urged by a restoring force into its seating determining its null position, which seating is formed through the cooperation of the surface regions of spherical bodies (14) with the surface regions of grooves (18), wherein the spherical bodies (14) with the associated grooves (18) are uniformly distributed in a plane perpendicular to the sensing rod (2) as bearings concentric with the sensing rod (2), and provide a plurality of bearing locations, characterized in that, at at least two of these bearing locations, the spherical bodies (14) are mounted fixed in a plane, irremovably on the movable or on the stationary part of the sensing head, in that the grooves (18) associated with the spherical bodies (14) are formed in cylindrical bodies (17) and in that the grooves (18) or the cylindrical bodies (17) are directed towards the spherical bodies (14) and are irremovably fixed, wherein the cylindrical bodies (17) are, before their fixing, rotatable about their own axes and displaceable in the axial direction and are thereby adaptable to the associated spherical bodies (14).
2. Multi-coordinate sensing head according to claim 1, characterized in that the spherical bodies (14) are fixed in the measuring plate (10) and the cylindrical bodies (17) are arranged in the sensing head housing bottom (13).
3. Multi-coordinate sensing head according to claim 1, characterized in that at least one bearing location is formed as a security against rotation.
4. Multi-coordinate sensing head according to claim 1, characterized in that the groove of the cylindrical bodies (17) is a V-groove (18).
5. Multi-coordinate sensing head according to claim 1, characterized in that the longitudinal axes of the cylindrical bodies (17) fitted in the sensing head housing bottom (13) include an acute angle with the longitudinal axis of the sensing rod (2) in the direction of the sensing ball (11).
6. Multi-coordinate sensing head according to claim 5, characterized in that the longitudinal axes of the cylindrical bodies (17) fitted in the sensing head housing bottom (13) run through the centre of the sensing ball (11).
7. Multi-coordinate sensing head according to claim 1, characterized in that the spherical bodies (14) are fixed in the sensing head housing bottom (13) and the cylindrical bodies (17) are components of the measuring plate (10).
8. Multi-coordinate sensing head according to claim 1, characterized in that the longitudinal axes of the cylindrical bodies (17) run parallel to the longitudinal axis of the sensing rod (2).
EP86100629A 1985-03-08 1986-01-18 Multi-coordinate contact probe Expired EP0197243B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86100629T ATE39285T1 (en) 1985-03-08 1986-01-18 MULTI-COORDINATE PROBE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3508396A DE3508396C1 (en) 1985-03-08 1985-03-08 Multi-coordinate probe
DE3508396 1985-03-08

Publications (2)

Publication Number Publication Date
EP0197243A1 EP0197243A1 (en) 1986-10-15
EP0197243B1 true EP0197243B1 (en) 1988-12-14

Family

ID=6264680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100629A Expired EP0197243B1 (en) 1985-03-08 1986-01-18 Multi-coordinate contact probe

Country Status (5)

Country Link
US (1) US4763421A (en)
EP (1) EP0197243B1 (en)
JP (1) JPS61207902A (en)
AT (1) ATE39285T1 (en)
DE (2) DE3508396C1 (en)

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Publication number Priority date Publication date Assignee Title
CN110017803A (en) * 2019-03-29 2019-07-16 太原理工大学 A kind of REVO gauge head B axle error of zero scaling method

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CN110017803A (en) * 2019-03-29 2019-07-16 太原理工大学 A kind of REVO gauge head B axle error of zero scaling method
CN110017803B (en) * 2019-03-29 2021-02-26 太原理工大学 Calibration method for zero error of B axis of REVO measuring head

Also Published As

Publication number Publication date
JPS61207902A (en) 1986-09-16
EP0197243A1 (en) 1986-10-15
US4763421A (en) 1988-08-16
ATE39285T1 (en) 1988-12-15
DE3661446D1 (en) 1989-01-19
JPH0460527B2 (en) 1992-09-28
DE3508396C1 (en) 1985-09-12

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